Utility to hide the mouse cursor and prevent screen blanking (http://blog.ghedini.me/post/2050358022/screensaver-inhibitor)

movie_time.c

/*
 * Utility to hide the mouse cursor and prevent screen blanking.
 *
 * Compile:
 * $ cc -o movietime movie_time.c -lX11
 *
 * Usage:
 * $ ./movietime
 *
 * Copyright (C) 2010 Alessandro Ghedini <alessandro@ghedini.me>
 * --------------------------------------------------------------
 * "THE BEER-WARE LICENSE" (Revision 42):
 * Alessandro Ghedini wrote this file. As long as you retain this
 * notice you can do whatever you want with this stuff. If we
 * meet some day, and you think this stuff is worth it, you can
 * buy me a beer in return.
 * --------------------------------------------------------------
 */

#include <unistd.h>

#include <X11/Xlib.h>

#define WAIT_FOR (5 * 60)

void hide_cursor(Display *dpy) {
	GC gc;
	XGCValues xgc = { .function = GXclear };
	XColor color  = { .pixel = 0, .red = 0, .flags = 0 };

	Pixmap mask;
	Cursor cursor;

	Window root  = DefaultRootWindow(dpy);

	mask = XCreatePixmap(dpy, root, 1, 1, 1);

	gc =  XCreateGC(dpy, mask, GCFunction, &xgc);
	XFillRectangle(dpy, mask, gc, 0, 0, 1, 1);

	cursor = XCreatePixmapCursor(dpy, mask, mask, &color, &color, 0, 0);

	XGrabPointer(
		dpy, root, 0,
		PointerMotionMask | ButtonPressMask | ButtonReleaseMask,
		GrabModeAsync, GrabModeAsync, None, cursor, CurrentTime
	);

	XFreePixmap(dpy, mask);
	XFreeGC(dpy, gc);
}

void move_cursor(Display *dpy) {
	int move_by = 1;

	while (1) {
		move_by -= move_by * 2;

		sleep(WAIT_FOR);

		XWarpPointer(dpy, None, None, 0, 0, 0, 0, 0, move_by);
		XFlush(dpy);
	}
}

int main(int argc, char *argv[]) {
	Display *dpy = XOpenDisplay(NULL);

	hide_cursor(dpy);
	move_cursor(dpy);

	XCloseDisplay(dpy);

	return 0;
}

Nice! Reminds me of http://xkcd.com/196/ :)

Maybe use XFixesHideCursor(dpy, win); would be easier?

https://cgit.freedesktop.org/xorg/proto/fixesproto/plain/fixesproto.txt